ABSTRACTThe current review article deals with the work that does relate to cloud computing system. Several studies remained recorded in the past and are being described in the following articles in order to define the Cloud Computing. A lot of work was recorded by scholars in the area of Cloud Computing. As with cloud computing, end users regularly pays only for the resource they use, and they avoid the inefficiencies and expenses of any unused capacity.

ABSTRACTWith the increase in IP based communication facilities and internet based commerce, the internet facility becomes more costly. For smooth and rapid networking a great deal of work has done for detecting, diagnosing and recovering errors in networks. As a result the overall reliability of internet has increased. Still there are numbers of failure modes exist which are very difficult to detect and therefore are unable to recover .If a network is unable to automatically react to failures, such failures are known as silent failures or BLACK HOLES. The various security threats increases on MANETs also. One of these security threats is Black Hole which drops all received data packets. In this paper we are analyzing the impact of Black hole attack on Ad Hoc.

ABSTRACTThe use of web applications has become increasingly popular in our daily life as reading newspapers making online payments for shopping etc. at the same time there is an increase in number of attacks that target them. So, in this paper we studied and present an overview to the SQL injection attacks (SQLIA) and the methods how to prevent those attacks. We also present and analyze existing detection and prevention techniques against SQL injection attacks. For each technique, we discuss its strengths and weaknesses of SQL injection attacks.
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ABSTRACTDistributed denial of service attacks disrupts the availability of a service or resources in the internet. DDOS is defined as an attack in which multiple compromised and vulnerable systems are used to attack a single target or victim machine to make the services unavailable to its intended users. The goals of DDOS attack are first it overloads the server with unwanted traffic which may lead to crash and second goal is to acquire the bandwidth by generating the large volume of unwanted traffic. This paper highlights the DDOS defence challenges. The classification of DDOS attacks and the defence mechanisms for DDOS attacks have been classified in this paper to have a close look at the DDOS problem and its severity.

ABSTRACTIn the present dissertation work, an attempt is made to investigate shear strength and ductility of fiber reinforced concrete beams by using hooked steel fiber without stirrups and the semi-empirical equations proposed by authors in past years, are compared to find which equation holds accurate results. For this investigation, the test beam specimens of 125 mm in width, 250 mm in depth, and 1150 mm in length are cast and steel fibers are varied from 0.5 % up to 2 % volume fraction. The longitudinal steel is kept constant, while shear span-to-depth ratio (a/d) is varied in the range 1, 1.25, and 1.5. All the beam specimens are tested under two-point loading up to failure, and failure load, first crack load, and central deflection are recorded concisely and precisely.

ABSTRACTThe design of dust explosion safety measures requires evaluation of the thermo kinetic parameters- maximum explosion pressure, rate of explosion-pressure rise and deflagration index either experimentally or theoretically. In this paper a model has been presented for prediction of these parameters for confined organic dust explosions in a spherical vessel. The explosion mechanism involves heating of dust particles, devolatilization reaction and volatiles combustion. The model is based on the assumption that the devolatilzation/ decomposition step is very fast and combustion controls dust explosion. The model developed quantifies influence of particle size and dust concentration on dust reactivity in terms of explosion severity. Control of particle size in dust explosion prevention and mitigation is recognized as a major inherent safety methodology. Increase of particle size may allow significant reduction in particle reaction rate eventually reducing the risk. The model predictions are compared with experimental data for organic dust- maize starch measured using CSIR-CBRI 20-L sphere. Close agreement between predicted and experimental results indicates that the model represents experimental measurements very well. The data on devolatilized fraction/ pyrolysis products used for model validation are based on experiments performed to study the influence of temperature, particle size and residence time on these data during pyrolysis of organic dusts using modified Godbert-Greenwald furnace..

ABSTRACTIn this study, the thermal management system of a notebook computer is investigated by using commercial finite volume Computational Fluid Dynamics (CFD) software. The major components such as the heat exchanger and steel heat dissipation plate as well as the heat pipe system are modelled according to their specifications. Heat dissipation values and necessary characteristics of the components are obtained from the manufacturer's specifications. Two different heat dissipation paths, the one which is utilized in the existing design and another which is suggested in new design are investigated. Also both the paths have been investigated for four different fluids such as water, ammonia, mercury and Freon assumed to be stationary inside the heat pipe. Adequacy of the existing & new design thermal management system is observed under constant air-inlet velocity, air-inlet temperature and CPU heat flux. Graphs have been plotted for average and maximum temperatures of the internal components. Considerable drop in CPU average temperature is obtained through the heat dissipation path suggested in the new design.

ABSTRACTThe efficiency improvement for flat-plate solar collector can reduce its size and obtain higher temperature fluid at outlet for wider application. In response to these demands, different highly-effective techniques have been used in the past to enhance the thermal performance of solar collectors including the methods of reducing the heat loss from the top surface or increasing the energy gain inside the solar converter. Many researches carried out numerous experimental and mathematical investigations on Performance improvement of solar flat plate heat collector. Enhancement techniques can be applied to flat-plate liquid solar collectors towards more compact and efficient designs. Extensive work has been carried out in order to enhance the performance of flat plate collector using former passive techniques and still there is very limited research literature available on performance enhancement using the tubes of special geometries.
The Paper gives the brief look on the suitability of changing shape of tubes of special geometry. The performance of solar flat plate collector with formed tubes is compared with performance of standard circular tube. The performance parameter like collector efficiency, mass flow rate and temperature difference of such formed tubes is much less than that of circular tube.
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ABSTRACTThe bases of all the civil engineering structures rest on soil/rock. The size of open foundation depends upon the bearing capacity and compressibility of soil/rock. The footings are often subjected to eccentric and inclined loading. The experimental and finite element analysis of Angle Shaped Footings has proved their acceptability under eccentric vertical or eccentric inclined static loading. In Angle Shaped Footings a vertical projection which is an integral part of footing and remains embedded in soil is there if the footing is subjected to eccentric vertical load while the projection is inclined in case the footings are subjected to eccentric inclined loading. However, the quadrant of eccentricity has to be known well before providing such footings as the footing projection is always provided towards the eccentricity. The earthquake is a natural phenomenon the occurrence of which is not in the hand of human being, and the civil engineers have to design the substructure taking care of earthquake force since the effect shall be ultimately transferred to foundation. Thus the study of foundation under dynamic loading is conducted to assess the behaviour of Angle Shaped Footings under variable parameters of experimental studies. After conducting exhaustive experimental studies on Angle Shaped Footings it has been found that Angle Shaped Footings displaced less in the direction parallel and perpendicular to direction of shaking but the tilt is more as compared to normal footing.
The overall displacement perpendicular to plane of footing is less. Thus it can be concluded that Angle Shaped Footings have their advantage over the normal conventional footings even under dynamic loading.